<?php session_start(); 
if (isset($_SESSION['uid'])) {
    header("Location: http://localhost/ptnhuan-web1/films.php?uid=".$_SESSION['uid']);
}
?>
<?php require_once 'data/users.php';?>
<form method="POST">
    Username<input type="text" name="username">
    Password<input type="password" name="password">
    <input type="submit" name="submit">
</form>
<?php if (isset($_POST['submit'])):?>
    <?php
        $username = $_POST['username'];
        $password = $_POST['password'];
        $isOk = FALSE;
        $index = -1;
        //Kiểm tra user
        for ($i = 0; $i < count($users); $i++) {
            if ((strcmp($users[$i]['username'], $username) == 0) && 
                (strcmp($users[$i]['password'], $password) == 0)) {
                $isOk = TRUE;
                $index = $i;
                $_SESSION['uid']=$index;
            }
        }
        //Xuất hiện ra lỗi
        if ($isOk) {
            //Đăng nhập thành công
            header("Location: http://localhost/ptnhuan-web1/films.php?uid=".$users[$index]['id']);
        } else {
            echo 'Đăng nhập thất bại';
        }
    ?>
<?php endif; ?>
